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2017 CB1100EX Speedometer error?
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3rdbike Offline
1st Service Completed

Albuquerque, NM USA
Posts: 100
Joined: Dec 2017
Post: #21
RE: 2017 CB1100EX Speedometer error?
(12-26-2017 09:41 AM)The ferret Wrote:  tuareg I have a good friend from Germany that comes to visit every once in awhile and he says he likes coming here because gas is on sale lol

3rd bike what speedo app did you download? to a smart phone?

I believe it's just called 'speedometer', downloaded it to my iPhone SE. It has a built in 'alarm' that flashes and beeps when you pass your choice of speed limit. (Like I could hear that on the bike!) The app eats up battery when flashing and beeping, and the only way around that is to buy an upgrade. I really just got this app to check my speedos.. Now that I'm done, I'll prolly delete it.
12-26-2017 01:28 PM
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tuareg Offline
1st Service Completed

Germany
Posts: 71
Joined: Jun 2015
Post: #22
RE: 2017 CB1100EX Speedometer error?
(12-26-2017 09:41 AM)The ferret Wrote:  tuareg I have a good friend from Germany that comes to visit every once in awhile and he says he likes coming here because gas is on sale lol

Yeah, he's right... There are worse places though, for example I always drive through Italy non stop because even diesel is a whopping 6.5 US$/gal (gas is 7)Big Grin
12-27-2017 12:38 AM
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Dengie Boy Offline
1st Service Completed

UK
Posts: 59
Joined: May 2014
Post: #23
2017 CB1100EX Speedometer error?
After a 5 year relationship with my CB11 (2013 European model), regrettably I have decided that I need to move on with my 'modern ride'

Having reflashed the ECU, gutted the catalytic converter, fitted a Yoshimura RS3 muffler, a K & N air filter and upped the front sprocket to 19 teeth, today was the day to at last find out how fast she would go.

Not far from where I live there is a 1.5 mile straight beside a reservoir with no pavements (ie no pedestrians), no roads joining it, a sweeping bend at the top before a slight drop to the flat road and best of all no police! Back in the day this was where we tested the work done on our bikes.

A teenager once again I came around the the top left hander in 3rd at about 70 mph. As the straight opened up in front of me, for the first time ever I wrung its neck to the redline, before notching up into 4th. At the end of flat mile there is a slight incline before a sharpish right hander. Tucked in behind the Road Comet II (with the high aero screen) with the revs nudging 8k the speedo was showing somewhere between 125 - 130 mph (at that speed concentration is required elsewhere!)

Very satisfied with this result I rode back and did the same run again, this time clicking up into 5th, this whilst dropping the revs to nearer 7k little effect on the speed over this short distance.

Happy with my first bike speed trial in 35 years I checked the Tomtom - 119?

So a question - is my speedo over reading by 10 mph at that speed, or was the Tomtom unable to register accurately over such a short distance?

I have to say that I suspect speedo error, as it does over read, according to the GPS by about 5 mph at 'legal' speeds.


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02-04-2018 04:18 PM
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Guth Offline
Forum Founder

Portland, OR
Posts: 3,360
Joined: Apr 2013
Post: #24
RE: 2017 CB1100EX Speedometer error?
What tires are you running Dengie Boy?

2013 CB1100: Placed deposit on Nov. 12, 2012; Received delivery on April 5, 2013.
02-04-2018 04:35 PM
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Dengie Boy Offline
1st Service Completed

UK
Posts: 59
Joined: May 2014
Post: #25
2017 CB1100EX Speedometer error?
Hi Guth
The OEM Dunlop Sportsmax Touring radials.

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02-05-2018 01:59 AM
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Tezza Offline
1st Service Completed

Queensland Australia
Posts: 175
Joined: Nov 2013
Post: #26
RE: 2017 CB1100EX Speedometer error?
I have checked my 2010 model with a GPS speedo. the honda speedo is reading a tad high...about 2 kph.
02-05-2018 02:25 AM
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Guth Offline
Forum Founder

Portland, OR
Posts: 3,360
Joined: Apr 2013
Post: #27
RE: 2017 CB1100EX Speedometer error?
As I recall, back when the CB1100 was first released here in the States, road tests showed that the speedometer was surprisingly accurate. That would have been with a fairly fresh set of tires. As tires wear and become smaller, I would imagine that the speedometer reading would become a bit faster over time but I have no idea to what degree.

2013 CB1100: Placed deposit on Nov. 12, 2012; Received delivery on April 5, 2013.
02-05-2018 08:57 AM
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SportsterDoc Offline
Running Like a Top

southern Nevada
Posts: 419
Joined: Nov 2017
Post: #28
RE: 2017 CB1100EX Speedometer error?
(02-05-2018 08:57 AM)Guth Wrote:  As I recall, back when the CB1100 was first released here in the States, road tests showed that the speedometer was surprisingly accurate. That would have been with a fairly fresh set of tires. As tires wear and become smaller, I would imagine that the speedometer reading would become a bit faster over time but I have no idea to what degree.

My 2014 standard has the most accurate speedo of any vehicle I have owned.

The speed sensor is on the rear.

If a new tire is 26" OD, the circumference would be 81.64" (pi x D)
If worn is 25.5", the circumference would be 80.07"

If 60 MPH is indicated with a new tire, then a worn tire (based upon 1/4" less tread on the radius) would indicate 58.84 MPH.

81.64/60 = 80.07/X

A new tire indication of 100 MPH, would be be 98.08 with a worn tire...again, that is based upon a 1/2" difference in diameter between new and old.

81.64/100 = 80.07/X

Not a big difference, about 2% regarding circumference, which is proportional to speed.

14 Honda CB1100 std
18 Yamaha XT250
16 Moto Guzzi V7II
17 Yamaha TW200
12 Triumph Bonneville
02 H-D Sportster 1200S
03 H-D Sportster XLH883
76 Honda CB750F
75 Honda CB360
70 Yamaha CT1
72 Yamaha CT2
72 Yamaha AT2
70 Honda SL350
70 Honda CL350
67 Honda CL160
67 Honda CB160
62 Honda CA110
02-05-2018 09:48 AM
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Dengie Boy Offline
1st Service Completed

UK
Posts: 59
Joined: May 2014
Post: #29
2017 CB1100EX Speedometer error?
The rear tyre is the OEM Dunlop Sportsmax Touring 140/70 R18.
The tread at the edge measures 4.6mm and in the centre 3.7mm.
It has done 6k miles always at the correct pressure of 42psi. ─░mage

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Just a thought, but why did Honda change the speedo after the 2013 bikes? To those that only go up to 120 mph? ─░mage

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(This post was last modified: 02-05-2018 11:35 AM by Dengie Boy.)
02-05-2018 11:29 AM
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LongRanger Offline
Road Warrior

Evergreen, CO
Posts: 2,004
Joined: Aug 2015
Post: #30
RE: 2017 CB1100EX Speedometer error?
Why? Marketing.

'14 Honda CB1100 DLX #000094
'15 BMW R1200RT
'13 BMW F800GT
'98 BMW K1200RS
'06 Ducati Monster 620
02-05-2018 12:15 PM
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